I use Clorox wipes to clean the cup on my eShopps 150. About every 3 days or so. Roughly every other month I pull the skimmer from the sump and take it apart to clean it up right. Mine comes apart easily and cleaning with the wipes takes no time. I usually pull the pump impeller first and soak it in vinegar first. Everything gets a rinse in HOT tap water then reassembled. Then I put it in a bucket of RODI and run it for a few minutes. Then its back in the sump.